Evaluation of Habitat Potential for Field Gudgeon in Drainage Canals Using Habitat Suitability Indexes: a Case Study of Yatsu Paddy Fields, Chiba Prefecture, Japan

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概要

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• To recover fish habitats and restore rich biota in rural areas, we evaluated the habitat potential for field gudgeon <I>Gnathopogon elongatus elongatus</I>, a representative species in rural areas, in non-improved drainage canals with soil and improved drainage canals having concrete walls but with a soil bottom in Yatsu paddy fields of the Shitada-gawa River basin, Chiba Prefecture, Japan, using habitat suitability indexes (SI). SI relations for water depth, water velocity, water width, substrate, and vegetation covering for life stages of the fish were developed using field research data collected from July 2002 to June 2004. The composite suitability indexes SI<SUB>depth</SUB> × SI<SUB>substrate</SUB> × SI<SUB>width</SUB> (larvae), SI<SUB>depth</SUB> × SI<SUB>velocity</SUB> × SI<SUB>width</SUB> (juvenile) and SI<SUB>depth</SUB> × SI<SUB>substrate</SUB> × SI<SUB>vegetation</SUB> (adult) were adopted statistically for calculation of the habitat potential (HP), expressed by a dimensionless weighted usable area. The values of HP varied monthly, but did not show significant differences between non-improved and improved canals for all life stages. This result showed that the improved canals were not inferior in producing fish habitats when compared with the non-improved canals. Also, it was clarified that the improved canals could even be used as alternative habitats to give temporary refuge to the fish, when a canal in this basin was being modified.

• 独立行政法人　国際農林水産業研究センターの論文

著者

• Mori Atsushi

  Department Of Applied Physics Faculty Of Engineering University Of Fukui

• Takemura Takeshi

  Department Of Civil And Environmental Engineering Tokyo Denki University

• KOIZUMI Noriyuki

  Department of Rural Environment, National Institute for Rural Engineering, National Agriculture and Food Research Organization

• OKUSHIMA Shuji

  Department of Planning and General Administration, National Institute for Rural Engineering

• EBIHARA Shu

  Nippon Kaiyo Co., Ltd.

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